Update docs on how to interact with local LLM (#1128)

* Update docstring for oai.completion.

Specify the details of how **config is used in Completion.

* Update docs about how to interact with local LLMs

* Update docs about how to interact with local LLMs

* Reformat file.

* Fix issues.

* Update website/blog/2023-07-14-Local-LLMs/index.mdx

Co-authored-by: Chi Wang <wang.chi@microsoft.com>

* Update website/blog/2023-07-14-Local-LLMs/index.mdx

Co-authored-by: Chi Wang <wang.chi@microsoft.com>

* Update website/docs/Use-Cases/Auto-Generation.md

Co-authored-by: Chi Wang <wang.chi@microsoft.com>

* Add documents about multiple workers.

* Update user instructions.

* Label big fix as optional

* Update website/blog/2023-07-14-Local-LLMs/index.mdx

Co-authored-by: Chi Wang <wang.chi@microsoft.com>

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Co-authored-by: Chi Wang <wang.chi@microsoft.com>